drivers/net/wireless/ath/ath10k/htt.c

   1 /*
   2  * Copyright (c) 2005-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <linux/slab.h>
  19 #include <linux/if_ether.h>
  20
  21 #include "htt.h"
  22 #include "core.h"
  23 #include "debug.h"
  24
  25 int ath10k_htt_connect(struct ath10k_htt *htt)
  26 {
  27         struct ath10k_htc_svc_conn_req conn_req;
  28         struct ath10k_htc_svc_conn_resp conn_resp;
  29         int status;
  30
  31         memset(&conn_req, 0, sizeof(conn_req));
  32         memset(&conn_resp, 0, sizeof(conn_resp));
  33
  34         conn_req.ep_ops.ep_tx_complete = ath10k_htt_htc_tx_complete;
  35         conn_req.ep_ops.ep_rx_complete = ath10k_htt_t2h_msg_handler;
  36
  37         /* connect to control service */
  38         conn_req.service_id = ATH10K_HTC_SVC_ID_HTT_DATA_MSG;
  39
  40         status = ath10k_htc_connect_service(&htt->ar->htc, &conn_req,
  41                                             &conn_resp);
  42
  43         if (status)
  44                 return status;
  45
  46         htt->eid = conn_resp.eid;
  47
  48         return 0;
  49 }
  50
  51 int ath10k_htt_init(struct ath10k *ar)
  52 {
  53         struct ath10k_htt *htt = &ar->htt;
  54
  55         htt->ar = ar;
  56
  57         /*
  58          * Prefetch enough data to satisfy target
  59          * classification engine.
  60          * This is for LL chips. HL chips will probably
  61          * transfer all frame in the tx fragment.
  62          */
  63         htt->prefetch_len =
  64                 36 + /* 802.11 + qos + ht */
  65                 4 + /* 802.1q */
  66                 8 + /* llc snap */
  67                 2; /* ip4 dscp or ip6 priority */
  68
  69         return 0;
  70 }
  71
  72 #define HTT_TARGET_VERSION_TIMEOUT_HZ (3*HZ)
  73
  74 static int ath10k_htt_verify_version(struct ath10k_htt *htt)
  75 {
  76         struct ath10k *ar = htt->ar;
  77
  78         ath10k_dbg(ar, ATH10K_DBG_BOOT, "htt target version %d.%d\n",
  79                    htt->target_version_major, htt->target_version_minor);
  80
  81         if (htt->target_version_major != 2 &&
  82             htt->target_version_major != 3) {
  83                 ath10k_err(ar, "unsupported htt major version %d. supported versions are 2 and 3\n",
  84                            htt->target_version_major);
  85                 return -ENOTSUPP;
  86         }
  87
  88         return 0;
  89 }
  90
  91 int ath10k_htt_setup(struct ath10k_htt *htt)
  92 {
  93         struct ath10k *ar = htt->ar;
  94         int status;
  95
  96         init_completion(&htt->target_version_received);
  97
  98         status = ath10k_htt_h2t_ver_req_msg(htt);
  99         if (status)
 100                 return status;
 101
 102         status = wait_for_completion_timeout(&htt->target_version_received,
 103                                              HTT_TARGET_VERSION_TIMEOUT_HZ);
 104         if (status == 0) {
 105                 ath10k_warn(ar, "htt version request timed out\n");
 106                 return -ETIMEDOUT;
 107         }
 108
 109         status = ath10k_htt_verify_version(htt);
 110         if (status)
 111                 return status;
 112
 113         return ath10k_htt_send_rx_ring_cfg_ll(htt);
 114 }